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Carolina Fanwort was first reported to occur in Frog Pond by Burkhard Plache in 2015, see http://halifaxfieldnaturalists.ca/posts/2015/fanwort/. The first report on iNaturalist, also by Burkhard, was in 2017 - see https://www.inaturalist.org/observations/7477009; that report included flowers, and seems definitive. My specimens from Frog Pond (this record) appear to be the same species. Within Nova Scotia to date, Carolina Fanwort is apparently restricted to Frog Pond (Halifax area), except for a couple of iNaturalist reports of it occurring in or close to Williams Lake (nearby) but with a wide range of uncertainty that includes Frog Pond; for one of those, the author clarified that the location was Frog Pond. So currently, there are no confirmed reports outside of Frog Pond.

These plants appeared intermediate between D. intermedia & D. rotundifolia, having the general aspect of D. intermedia (tight, leafy clumps of somewhat erect leaves; semi-aquatic, seasonally exposed lakeshore habitat) but having some leaves quite wide like D. rotundifolia and most leaves wider than typical D. intermedia. No flowers were present, which is described as typical for this hybrid. @cdlew @f_rivadavia @thilokrueger - thanks!